Teenage body odor can be a common concern, but there are safe and effective natural remedies to help manage it. Here are a few solutions:

1. Good Hygiene: Encourage your teenager to shower daily, especially after physical activity, and to use a mild soap to keep their skin clean.
2. Dietary Changes: Consuming a diet rich in fresh fruits and vegetables, and avoiding foods high in processed sugars and fats, can help reduce body odor.
3. Natural Deodorants: Look for deodorants that are free from harsh chemicals and contain natural ingredients like tea tree oil, witch hazel, or baking soda.
4. Stay Hydrated: Drinking plenty of water can help flush out toxins from the body, which may contribute to body odor.
5. Avoid Synthetic Fabrics: Encourage your teenager to wear breathable, natural fabrics like cotton, which can help reduce sweating and body odor.

It's important to note that while these remedies can be helpful, it's always best to consult with a healthcare professional if body odor is persistent or accompanied by other symptoms.